Yes - you can either hand it out as a souvenir or let it dry and re-use it again and again.

Simon, this trick is NOT impromptu.

It requires setup beforehand.

Yes, I'm aware that they have said it is reusable - but are you really going to deny your spectators the souvenir? This probably means, unless you attach some sort of gimmick on top of the napkin, that you will need to have several of the "item" prepared.

>> Dan White:
In this video, you state that you are "at someone's home or restaurant, you can take - A - napkin". Is this simply wording in order to make the average consumer believe it is a borrowed napkin, or was it just a mistake?

In other words- Is the napkin that "reveals" the object of the performance truly, honestly, and 100% purely the spectator's napkin?

Cedric, Bich's version was verifiably, independently created over 4 years ago (2005). While this plot has been accomplished by many magicians over the past few years, I have not seen any other version published that utilizes the same method as Watermark. Hope this clears things up.